But officials are hopeful that repairs have solved the problem, and that Discovery will blast off Sunday evening. Good weather is forecast.

Discovery is more than a month late for its scheduled trip to the international space station. First, hydrogen gas valves inside the shuttle had to be double- and triple-checked. Then on Wednesday, hydrogen gas began leaking during fueling where a vent line hooks up to the external fuel tank.

Workers have replaced that hookup and a pair of seals. Nothing obvious was wrong with the removed parts.

Discovery and seven astronauts are set to carry up one last set of solar wings for the space station.

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